Related Experiment Video
Updated: Feb 27, 2026
10:26
Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
12.0K
Tunable Fano Resonance in Asymmetric MIM Waveguide Structure
Xuefeng Zhao1, Zhidong Zhang2, Shubin Yan3
1Science and Technology on Electronic Test and Measurement Laboratory, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China. xf_zhao@st.nuc.edu.cn.
Sensors (Basel, Switzerland)
|July 5, 2017
Summary
This study proposes a plasmonic waveguide system for enhanced sensing. The novel design achieves high sensitivity and figure of merit, paving the way for advanced on-chip sensors.
Area of Science:
- Photonics and Nanotechnology
- Plasmonics
- Optical Sensing
Background:
- Surface plasmon polaritons (SPPs) enable subwavelength light confinement.
- Metal-insulator-metal (MIM) waveguides are key components in plasmonic devices.
- Fano resonances offer sharp spectral features for sensing applications.
Purpose of the Study:
- To propose and investigate a novel plasmonic waveguide coupled system.
- To analyze the transmission properties and sensing capabilities of the designed system.
- To optimize the system for high sensitivity and figure of merit in refractive index sensing.
Main Methods:
- Utilizing a metal-insulator-metal (MIM) waveguide with silver baffles and a coupled ring cavity.
- Employing the finite element method (FEM) for numerical simulations.
- Analyzing the interaction between Fabry-Perot (F-P) and ring cavity resonances.
Main Results:
- Observed a Fano profile in the transmission spectrum due to coupled resonances.
- Achieved a maximum sensitivity of 718 nm/RIU.
- Attained a maximum figure of merit (FOM) of 4354.
- Investigated the influence of structural parameters on system performance.
Conclusions:
- The proposed plasmonic system demonstrates excellent sensing performance.
- The Fano resonance arises from the interplay of broadband and narrowband resonances.
- Results provide a design guideline for developing highly sensitive on-chip sensors based on SPPs.
Related Concept Videos
01:28Standing Waves in a Cavity
1.6K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.6K
01:14Sound Waves: Resonance
3.6K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
3.6K
01:23Parallel Resonance
666
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
666
01:04Modes of Standing Waves: II
1.8K
The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
1.8K